donohoe



(No Model.) 2 SheetsSheet 1.

H. DONOI-IOE.

v BRAKE FOR DUMB WAITERS. N0. 404,07 Patented May 28, 1889.

WITNESSES: INVENTOR,

Ju A014 A TTOIMIEYS,

N. PErtRs. PholoLithognpher. Washington 0.0

(No Model.) 2 Sheets-Sheet 2.

H. DONOHOE.

BRAKE FOR DUMB WAITERS. No. 404076. Patented May 28, 1889.

WITNESSES: lNI/E/V A TTOR/VEYJ,

UNITED STATES PATENT OFFICE.

I'IUGII DONOHOE, OF NEIV YORK, N. Y.

BRAKE FOR DUMB-WAITERS.

SPECIFICATION forming part of Letters Patent No. 404,076, dated May 28,1889.

Application filed February 15, 1889. Serial No. 300,012. (No model.)

To ctZZ whom it may concern:

Be it known that I, HUGH DONOHOE, of the city, county, and State of NewYork, have invented certain new and useful Improvements in Brakes forDumb-Waiters, of which the following is a full, clear, and exactdescription.

The invention relates to brake mechanisms for dumb-waiters; and itsobject is to furnish a simple and reliable device for conveniently andrapidly braking the main pulley carrying the carriage.

The invention consists of certain parts and details and combinations ofthe same, as will be fully described hereinafter, and then pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a sectional side elevation of the improvement as applied andwith parts in section. Fig. 2 is an enlarged plan view of theimprovement with the pin in section, and Fig. 3 is a sectional sideelevation of the same with parts broken out.

In the dumb-waiter shaft A is held near its upper end the usualframe-work, A, in which is mounted to turn in suitable bearings theshaft B, carrying the carriage-pulley C, over which passes the rope D,supporting the carriage E, mounted to travel vertically in the shaft Aon suitable guides and provided with the usual counter-weights tocounterbalance the carriage; On the shaft B is also secured abrake-wheel, F, in line with which is held a similarly-shaped wheel, G,secured on a shaft, G, mounted to turn in suitable bearings 011 theframe-work A. The shafts B and G are placed in a horizontal line, asshown, and sufficient space is left between the peripheries of thewheels F and G for the admission of the pin H, provided with a wedge orcone, I, held above the horizontal center of the wheels F and G. The pinH is preferably made of rubber; but other 1naterial-such as iron orwood-will also answer the purpose.

From the top of the Wedge or cone I extends a pin, H, passing looselythrough a suitable guide, H held in the shaft A. The lower end of thepin H rests in a socket, J, formed on the free end of a brake-shoe, J,fulcrumed at J 2 to the main frame A. The

brake-shoe J operates against the periphery of the brake-wheel F. Theunder side of the free end of the brake-shoe J is engaged by the innerend of the lever K,fulerumed at K in the shaft A, and connected at itsouter end with a rope, L, extending downward in the front opening of theshaft, as is shown in Fig. 1. The rope L passes in the bottom of theshaft over a pulley, N, and then extends horizontally to pass under apulley, N, and up over a pulley, N and then hangs down to support aweight, 0, as shown in said Fig. 1. To the outer end of the lever K isalso secured one end of a rope, P, which extends upward and passes overa pulley, Q, then extends horizontally and passes over a pulley, Q, fromwhich the rope extends downward and carries a weight, R. The weights Rand 0 counterbalance the lever K and the brake-shoe J, and the rope Lserves to move the lever K to any desired position.

The operation is as follows: When the brakeshoe J and the lever K are inthe position shown in Fig. 1-that is, the brake-shoe J is disengagedfrom the brake-wheel Fthen the weighted carriage E is locked in place bythe wedge or cone I passing against the peripheries of the wheels F andG and preventing a rotary motion of the wheel F. The heavier the weightin the carriage E, the tighter the wedge I will be drawn down betweenthe pulleys F and G. Then the operator desires to lower the carriage Ewith its contents, he pulls slightly on the rope L, so that the lever K,engaging the free end of the brake-shoe J, causes the latter to swingupward, thereby raising the pin II and disengaging the wedge I fromcontact with the peripheries of the wheels F and G. The wheel F, theshaft B, and the pulley C are now permitted to turn, so that the rope D,with the carriage E, moves downward. The operator usu. lly has hold ofthe front of the rope D to lower the carriage at any desired rate ofspeed. The moment he releases his pull 011 the rope L and lifts thelatter to raise the counterbalancing-weight O the brake-shoe J dropsdownward, so that the pin I'I slides in the same direction and the wedgeI again engages the peripheries of the wheels F and G. The wheel is thusagain braked.

When the operator hoists the carriage in the usual. manner, the pin IIis always ready to drop between the two pulleys F and G whenever theoperator releases his hold on the rope, so that the carriage is held inplace by pin H engaging the pulleys. llhe operator can apply thebrake-shoe J very suddenly whenever he desires bypulling hard on therope L, so that the inner end of the lever K throws the brake-shoe J incontact with the periphery of the wheel F. The wedge I is thencompletely disengaged from the wheels F and G, as is plainly shown inFigs. 2 and Thus it will be seen that by a very simple device I amenabled to brake the main shaft carrying the pulley supporting thecarriage Whenever desired.

Having thus fully described my invention, I claim as newand desire tosecure byLetters Patent 1. The combination, with two aligning wheels,one of which is secured on a shaft to be controlled, of a brake-shoeheld below one of said wheels, and a .pin provided with a wedgesupported on the free end of the brakeshoe to extend between saidwheels, substantiallyas shown and described.

2. In a dumb-waitenthe combination, with a main shaft supporting thecarriage-pulley, of a brake-wheel secured on the said shaft, a secondwheel held in line with the said brakewheel, a :pinprovided with a wedgeand held between thesaid two pulleys, and a brake-shoe supporting thesaid pin, and a lever operating on the said brake-shoe and under thecontrol of the operator, substantially as shown and described.

4:. In a dumb-waiter, the combination, with a main shaft supporting thecarriage-pulley, of a brake-wheel secured on the said shaft, a secondwheel held in line with the saidbrakewheel, a-pin provided with a wedgeand held between the said two pulleys, a brake-shoe adapted to engagethe said brake-wheel and supporting the said ,pin,a lever operating onthe said brake-shoe, and weighted ropes connected with the said lever tocounterbalance and operate the same, substantially as shown anddescribed.

HUGH DONOHOE.

Witnesses:

THEo. G. HOSTER, C. SEDGWIOK.

